Tap-making machine.



, F. MULLER. TAP MAKING MACHINE.

APPLICATION FILED DEC. 7. 1912.

1 155432 0 I Patented Oct. 5,1915.

6 SHEETSSHEET I.

Wm v j I gvwenfoz mire c c1 v F- MULLER.

TAP MAKING MACHINE. APPucATlon FILED Me. 7. 1912.

Patented Oct. ,5, 1915.

6 SHEETS-SHEET 2.

23 M $251 Qjfozum F. MULLER. TAP MAKING MACHINE.

APPLICATION HLED DEC. 7. 1912- wwm i r Patented Oct. 5, 1915.

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Q vi bmeooeo F. MULLER.

TAP MAKING MACHINE. APPLICATION FILED DEC. 7. I9 l2 Patented 061;. 5

6 SHEETSfSHEET 4.

F. MULLER.

TAP MAKING MACHINE.

APPLICATION FILED DEC, 7, 1912.

Patented 001;.5,1915.

6 SHEETS-SHEET 5.

I I I F. MULLER.

TAP MAKING MACHINE.

' APPLICATION FILED DEC-7.1912.

Patented Oct. 5, 1915.

6 SHEETS-SHEET 6.

- wi/lmwoeaz $1 Waug who-z xrw 9% 'A/ WM The dnviiti'om consists vi,nfilllfeeaccompanying1drauldnigs,'iwherein inents of the invention,serve connection *which normally lies inthe path of a lug19 -11 o 'tTEDsrarns ra'rnnr orr ca FRIEDERICH M'ULLER, OF HARTFORD, CONNECTICUT,ASSIGNOR TO PRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, ACORBORATION OF NEW JERSEY.

TAP-MAKING MACHINE.

Specification of Letters Patent.

Patented Oct. 5, 1915.

Application filed December 7, 1912. Serial No. 735,388.

To all whom it may concern Be it known that I, FRIEDERICH MtiLLER,

a citizen of the United States, and a resident of Hartford, county ofHartford, State of Connecticut, have invented certain new and usefulImprovements in Tap-Making Machines, of which the following is aspecification.

This invention relates to a machine for performing certain operations'inthe manufacture of taps and the like, and more particularly for cuttingthe threads on tap blanks with great precision and celerity and withoutrequiring the exercise of great care or skill on the part of theoperator.

The main objects of the invention are to provide for makingautomatically a second or finishing cut in a machine of this characterwhereby great accuracy in the diameter, pitch, and finish of the tapblanks is attained; also to provide for making auto; m atically such afinishing cut in a machine wherein the threads cut in the lands of thetap? anon-concentric with the axis of the tap or t backed off to giveproper clearance t'oithe cutting edges of the tap; also to provideofortheimaintenance of an extremely accltratiahd iiniform relative movementbetwifeen th'e'l cutting tool and the blank support duir-ingltheeiitireicutting operation to make possibletthelproductiohaof a thread which isaccurate as regards tch'i as well as diameter; alsotoiprdvideitormanying the relative movemeht betweeri: thereuttingtooland the blank slippontazwlreiteliyoithreads10f various pitchesamagy beipiiotlueedlyhalsoato. provide :IHBbhHIIlSIIBP fOI'i (establishingwithrgreat accuracy raminitial predetermined :relatiiin between''thee.buttihgn'tbolaa fiil .the iblarrlristrpcarerbrzskillhoifihesaandrbther objectssof the v inventi on will bein part obvious and. art

A the novel'vime provbmen ts demcspand combinations henes tndisolseflgs-rrmo-no ?no all? no illustrated one of the many possibleembodi with the description herein to explain the principles of theinvention and one manner of carrying the invention into effect.

Qf the drawings: Figure 1 is a front elevatlon of the machine, certainparts being broken away and shown in section to illustrate the details;Fig. 2 is a similar rear elevation of the machine; Fig. 3 is a planview'; Fig. 4 is an elevation'of that end of the ma-. chine shown at theleft in Fig. 1; Fig. 5 is a vertical transverse section of the machinetaken on the line A"B of Fig. 3, certain parts being omitted for thesakeof clearness; Fig. 6 is a vertical longitudinal section taken on theline CD of Fig. 3; Fig. 7 1s a vertical transverse section taken on theline EF of Fig. 3; Fig. 8 is an enlarged view of a'cutter used forthreading tap blanks; and Fig. 9 is an end elevationof the same;

Theparticular embodiment of the invention illustrated in the drawings isa machine for simultaneously milling the 'thread grooves in tap blanks.This machine comprises a frame 1 having suitable standards and bracketsfor supporting the various elements of the machine. The main element ofthe support forthe tap blanks comprises a hollow spindle 2 having achuck 3 which is provided with a worm wheel 6 which meshes Witllua worm7, see Fig.5, on a cross shaft 8.

flihisishaft is driven by means of spiral gears 9 and 10 from a shaft 11located at the back of'tlie machine and best shown in Fig. 2.

ThBU litreceives motion from a main drivingvshaftifl through a clutch13.. This clutch is; connected by a rod 14 with a suitableaac'tuatingmechanism which, as shown, comprises: an arm L 15: fixed on a rockshaft16 i suitablyjoiirnaled on the frame. A. handle 4:17pivotediontliisvrockshaft and is provided with a laterally projectingfinger 18 lutions.

finger 18 is normally held in the path of the lug 19 by a spring 22coiled around the handle 17 and fixed at one end to the handle and atthe other end to the rockshaft'lfi. The clutch member 13 is normallypressed toward its operative position by a spring 23 which surrounds therod 14 and is confined between a collar 24 on this rod and the end of abushing 25 through which the rod spindle, the collar acting upon levers5 which passes.

When the handle 17 is actuated to disengage the finger 18 from the lug19, the clutch will be actuated by its spring 23 to connect the drivingmechanism for thespindle 2 with the power shaft 12,-and the spindle willcontinue to rotate until the lug 19 on the gear 20 engages the finger 18and disengages the clutch. The rotation of the spindle Will thencease'and will not begin again until the handle '17 is again actuated.It will be seen that by suitably proportioning the gear 20 and pinion 21the spindle 2' may be given any desired number of revo- In other Words,the number of revolutions of the spindle 2 during each cycle ofoperation will be predetermined by suitably proportioning the gear 20and the pinion 21. In the construction shown the gear 20 is twice thediameter of the pinion 21 and hence the spindle 2 will make tworevolutions whenever it is started.

To insure the uniform support for the tap blanks against the action ofthe cutter, it is desirable to support the tap blanks at each end. Asabove indicated, the tap blank is supported at one end by the spindle 2and is also rotated by the spindle. Any suitable means may be providedto support the opposite end of the tap blank or that portion which isacted upon by the cutter. It is desirable to support the tap blanks by atail stock having a dead center adapted to engage the endof the tapblanks. chine of this character, however, it is impossible orinconvenient to make use of the ordinary tail stock because of the factthat the cutter, which is preferably constructed to operate upon thefull length of the threaded portion of the tap blanks, or the supportingand driving mechanism for the cutter would be interfered with. In otherwords, it is necessary or desirable to provide a tail stock which islocated at one side of the axis of the tap blanks.

In accordance with one feature of the present invention, this tailstock, which comprises one member of the blank-supporting means,-consists of an arm 30 pivotally mounted on a stud'31 fixed in a carriage32.

The carriage 32 is adjustably supported upon the frame 1 so that thetail stock may v be moved toward and from the spindle toopposite' end ofthe cutter is supported on; 13.

In a maaccommodate taps of different lengths and is held in its adjustedposition by bolts 33. The arm 30 carrying the dead center 34 ispivotally mounted to permit; the tap blanks erative position by theactuation of a single member. This may be accomplished in various ways.In the embodiment shown the single operating member comprises a lever 35pivotally mounted on a stud 36 fixed on the carriage 32 and connected bya link 37 to the arm 30. When the arm 30 is moved into its operativeposition, it is brought up against a stop which serves both to limit itsmotion toward the chuck 3 and to hold it down or firmly clamp it uponthe carriage 32. As shown in Fig. 1, this stop comprises an inclinedshoulder 38 in the carriage 31 which is engaged by a correspondinglybeveled'projection 39 fixed on the arm 30 by a bolt 40. It will be seenthat the lever 35 and link 37 constitute a toggle mechanism by which thearm 30 is moved to and from its operative position and which by thestraightening of the toggle is adapted to lock the arm in its operativeposition with any desired degree of force. For the purpose of limitingthe locking movement of the toggle aset screw 41 is provided and to.enable the force with which the toggle acts upon the arm 30 to hold itin its locked position to be properly adjusted, the stud 36 on which thelever 35 is pivoted is provided with an eccentric portion 42 which bythe turning of the stud permits of the pivot of the lever being broughtinto proper relation to the stop shoulder 38 for the arm 30.. The studis held in its adjusted position by a nut 43,

.for simultaneously cutting a plurality of thread grooves on the tapblanks comprises a milling cutter 45 which, as shown in the enlargedviews, Figs. 8 and 9, is provided v with a multiplicity of cutting teetharranged in circumferential rows 45, the distances betweenwhich rowscorrespond to the pitch of the thread to be out. As shown, this cutterhas a length somewhat greater than the length of thethreads to be outupon the tap blanks butit will be understood that this is not essential.

.The milling cutter may be supported and driven in various ways. Asshown, it is mounted at one end on a spindle 46 and is suitablyjournaled in a bracket 47 adjustably fixed on the cutter carriage 48.The

a dead center 49 carried by an adjustable slide 50 suitably mounted onthe carriage 48.

To permit of the cutter being adjusted to and from the axis of theblank, the carriage 48 see Figs. 6 and 7 is mounted to slide on asecondary carriage 51 and is connected thereto by an adjusting screw 52and a clamp bolt 53, the adjusting screw being provided with the usualhand wheel 54:. To permit of the adjustment of the cutter to bring itsaxis into exact parallelism with or at any desired angle to the axis ofthe blank support, the secondary carriage 51 is rotatably mounted upon athird carriage 55 and is adjusted with relation thereto by the setscrews 56 and 57, see Fig. 3. When the angular adj ustment has beeneffected, the carriages 51 and 55 are securely clamped by a clamp screw58.

In order that the cutter may be moved away from the blank after thethreading operation has been completed and thus facilitate the insertionand removal of the blanks and at the same time make it possible torestore the cutter to a predetermined initial position withoutdisturbing its adjustment, means are provided for effecting a relativeseparating movement between the cutter and blank supports in a directionnormal to the axis of the blank support. This may be effected in variousways. In the embodiment illustrated this relative movement normal to theaxis, which is independent of the described adjustment of the cutter, iseffected by moving the cutter support with relation to the blanksupport. To this end, the third carriage 55 is mounted for movement in adirection at right angles to the axis of the blank support in suitableways formedrin the primary cutter carriage 60, see Figs. 6 and 7. Thecarriage 55 is normally pressed outward, or in a direction to separatethe cutter from the blank, by a spring 61, see Fig. 7, which spring isconfined between a shoulder on the carriage 60 and a collar on an'adjusting screw 62 fixed on the carriage 55.. The position of thecarriage 55 is determined by a lever 63 pivoted on the carriage 60 andhaving a short arm which engages a shoulder on the carriage 55 and along arm which is engaged by a.

connection 64: suitably mounted in a bracket '65 fixedon the frame 1. Atits outer end .the' connection 64 is provided with an adjusting screw 66which is engaged by a lever 67 pivoted on the bracket and arranged to beactuated a cam 68 on a reciprocat ing slide orcam member 69 suitablysupported on the bracket 65 and a similar' bracket 70, these bracketsalso serving as supports for the power shaft 12 and drive shaft 11previously referred to. The sliding cam member 69 has a limited endwisereciprocating motion and maybe operated in any suitable way. In theembodiment illustrated the member 69 is actuated by a manually operativemember which comprises a lever 72, see Fig. 3, this lever beingconnected to the member 69 by a lever 71. It will be seen that when thecam slide 69 is at its extreme position to the left, as shown in Fig. 3,the lei er 67 will engage the low part of the cam 68 so that the spring61 will be free to move the carriage 55 in'a direction to separate thecutter from the blank. When, however, the slide 69 is moved to the limitof its stroke in the opposite direction,

the cam 68 will actuate the lever 67 which,

through the connection 64, will actuate the also provided for effectinga relative vibrat-- ing movement between the cutter and blank supportsduring the cutting operation. In the particular embodiment illustratedthis is for the purpose of cutting the thread grooves in the successivelands of the tap blanks progressively deeper or, in other words, to backoff the threads of the successive lands. To accomplish this, the cuttersupport is moved gradually inward dur ing the operation of cutting thethreads in each of the lands of a tap blank and is then allowed toreturn to its initial position before the. threading operation of thenextland begins. In the embodiment illustrated this backingotf vibratorymovement of the cutter is effected by a cam 7 5 mounted on a shaft 76and arranged in coiiperative relation to the lever 63. ,This cam-isgiven one revolution for each of the lands on the tap blank, there beingfour revolutions of the cam 75 for each revolution o the spindle 2 inthe illustrated embodiment. The operative surface of the cam 75preferably is concentric for a certain fraction of circumference, sayone-fourth, and has a slight uniform increase or radius throughout there mainer of its circumference, beginning and ending at the notch 75.The purpose of this is to make the lands of the tap circular for a shortdistance back from the cutting edges, the backed off portions extendingfrom this point to the rear edges of the lands. The notch 7 5 isprovided to permit of the separating movement ofthe cutter abovedescribed. When the separating movement takes place, the cam-engagingportion of the lever enters this notch;

In order that the machine may be used for cutting tap blanks havingvarious numbers of lands, means are provided for changing the number ofrotations of the shaft 76 with reference to each rotation of the spindle2. To this end, the shaft 76 is connected by a slip joint 77, thepurpose-of which will hereafter appear, to a shaft 78. The shaft 78, seeFig. 5, is provided with a worm wheel 79 which is engaged by a worm 80on a cross shaft 81, see Fig. 3, located adjacent to the cross shaft 8by which the spindle 2 is driven, these two shafts being connected bychange gears, as shown in Fig. 1. This gearing comprises a gear 82 fixedon the shaft 81 meshing with intermediate gear 83 which meshes with agear 84 fixed on theshaft 8. The speed of the shaft 81 with reference tothe shaft 8 may be conveniently varied by removing the gear 84 andsubstituting others of different sizes, the gear 83 being mounted in anadjusting arm 85 so that the gear 83 may be brought into proper meshwith the gear 8& irrespective of the size of the latter. By giving thegear 84 the proper dimensions the speed of the shaft'81 with referenceto the shaft 8 may be so determined as to give the cam 75 any desirednumber of rotations during each rotation of the spindle 2.

The principal object in causing the tap blank to make a second or thirdrevolution during the operation of threading the blank is to enable thecutter to make a heavy cut during the first revolution of the tapblankand then during the succeeding revolution or revolutions to make alighter finishing cutor cuts, thereby producing a smoother and moreperfectly sized article.- While a second or finishing cut mightsometimes be satisfactorily made without advancing the cutter withreference to the blank, it is de stead of operating directly upon theleverv 63 operates upon a secondary lever or ad- .justing arm 86pivotally mounted on the lever 63' and adjustable thereon by a series ofstop members which are successively brought into operation duringsuccessive revolutions of the spindle 2. Since in the particular machineshown. in the accompanying drawing the spindle makes two revolutionsduring each'cycle, there are two of these stops provided for the arm 86.The first of the stops is a set screw 87- which acts as an abutment forthe arm 86 Fig. 7 during the first revolution of the spindle. During thesecond revolution of the. spindle a second stop 88 is brought into theoperation to hold the arm 86 somewhat farther in toward the cam 75 sothat the latter will move the lever 63 to a somewhat greater distanceduring each revolution than thereby causing the cutter to be somewhatfurther advanced uring eaclr vibration than it was during the firstrevolution of the tap blank. The stop 88 is in the form of a cam whichis fixed on a spindle 89. This spindle 89 is connected by a slip joint89', the purpose of which will presently appear, to a spindle 90 seeFigs. 1 and 5, and the spindle 90 is provided with an arm 91 which isconnected by a link 92 to a lever 93, and this lever is actuated by acam 94 carried by the gear 20 previously described. This cam is soformed that during the first revolution of the spindle 2 the stops 88will be held out of operative position, and during 'the secondrevolution of the spindle 2 the stop will be held in its operativeposition,

of the spindle, the adjusting arm 86 being set a little farther in'toward. the cam 75 by each adjustment of the cam 88.

In order that the cutter 45 may cut a proper thread upon the blank, arelative movement parallel to the axis of the tap blank while the latteris being revolved, at a rate corresponding to the pitch of the threadbeing cut must 'be provided. As far'as certain features of the inventionare concerned,

any suitable means may be provided for effecting this or ,a similarfeeding movement. In the machine shown this relative feeding movement isefi'ected by moving the cutter support with relation to the blanksupport which is held against movement in the axial direction. Thismovement of the cutter support is accomplished by moving the primarycutter carriage 60 above referred to along the ways provided for it inthe main frame- 1, as indicated in-Fig. '7. The mechanism by which thismovement is effected maybe varied in detail. As shown, this mechanismcomprises a transversely moving bar 95 which has an inclined orwedgelike cam face 96 adapted to cooperate with a stationary abutment 97see Fig. 3. A uniform movement is imparted to this wedge bar during arotation of the spindle 2 by means of'a train. of gears comprising a.pinion 98 meshing with a rack 98 cut on the bar 95, which pinion isrotated by a worm wheel 99 ar ranged to mesh with a worm 100 carried atone end of a shaft which is suitably journaled in a standard lOl andprovided at its opposite end with a gear 102 see Fig. 6. This gear 102meshes with another gear 103 fixed on a stud shaft journaled in an arm104:, the stud shaft carrying at its opposite shaft 107, see Fig. 6,which carries at its other end a bevel gear 108 arranged tomesh with asimilar gear 109 fixed on the shaft 8 by which the spindle 2 is rotated.It will be seen that the worm 100 in effect constitutes a feed screwbywhich the cutter is given its feeding movement, this movement beingrendered extremely accurate. by reason ofthe interposition of thewedgebar between the screw and the cutter carriage. The wedgebar has theeffect of reducing or rendering inappreciable any small defects in thefeed screw or in the rate at which it is driven.

In order that the longitudinal movement of the cutter may be varied asrequired to cut threads of different pitches, the rate of.

movement of the wedgebar 95 with reference to the rotation of thespindle 2 is varied; In the embodiment illustrated this is-convenientlyaccomplished by changing the size of the gear 102, the arm 106 beingmade adjustable so that the gear 103 may be made to mesh with the gear102 whatever the size of the latter. I

In order that the cutter may be returned to a predetermined initial"position in the direction of the axis of the blank after the.threadcutting operatibn has been completed, the wedgebar 95 must bereturned to its. initial position. To do this the train of gearing bywhich the wedgebar is driven is first disconnected and then after thewedgebar has been returned, the connection reestablished, In the presentembodiment of the invention these operations are effected by the simpleactuation of a single member, this preferably being the same member bywhich the operations of separating the cutter from the blank in adirection normal to its axis and returning the cutter to its initialposition in the same way are effected, to-wit, the cam bar 69. To thisend, the cam bar 69 is providedwith a cam 110 see Fig. 3 which operatesthrough a lever 111 fulcrumed on a stud-112 to shift the carriage 113 onwhich the wedgebar 95, pinion 98, and worm wheel 99 are mounted, so asto move the worm Wheel 99 outrof mesh With the feed screw or worm 100.,This operation occurs during the first part of the movement of the cambar 69 toward the left as shown in Fig. 3. After the gearing hasi'thusbeen discbnnected the wedgebar' 95 is restored to its. initial positionby a cam 114 on the bar.

69, this cam being arranged to actuate a lever 115 fu'lcrumed on abracket extension 116 and a'rrangedto engage a pin 117 at the bar 95.This lever is shown in Fig. 3 in the position to which it was moved bythe cam 114 when the bar 69 .was moved to the limit of its stroke to theleft. As shown in Fig. 3, the bar 69 has been moved back to its initialposition, in which position the cam 110 has released the lever 111, andthe carriage 113 has been moved back to its initial position by a spring118 which is confined between the end of the carriage 113 and a shoulderon an adjusting screw supported in the end of a bracket 119. After thebar 95 has beenreturnedto its initial position by the cam 114 and lever115 during the movement of the bar 69 to the left, the cutter isrestored to itsinitial position in the direction of theaxis of theblank, which position is predetermined by the contact of the wedge surface 96 of the bar 95 with the abutment 97. In the embodimentillustrated this predetermined initial relation between the cutter andblank supports is effected through the operation of the manuallyoperable member 7 2 by a hook 120 carried by the cam member 69, saidhook being arranged to engage an arm 121 projecting from the primarycutter carriage 60. The slip joints 77 and 89' previously referred toare provided to permit of the longitudinal movements of the carriage inwhich the cams and 88 are mounted without disturbing the drivingconnections for these cams. It may be here noted that the shafts 8.9 and90 by which the cam 88 is operated are also provided with universaljoints, as indicated in Fig. 1, to permit of the swinging movements ofthe lever 63 on which the cam 88 is mounted. The lever 71 serves toactuate the collar 4: by which the chuck 3 is actuated through a sleeve122 which is mounted on a stud 123 fixed on the frame, and isconnectedon the one hand with the lever 71 by a pin 124 and )on theother hand with the collar 4 by a yoke 125, as clearly shown in-Fig. 1.The

cutter 45 is continuously driven in any suitable way, as from a pulley126, the shaftof which is connected by universal joints 127, 128 withthe spindle 46 of the cutter.

The general operation of the machine may be described as follows; Theshank of a i tap blank is slipped into the chuck 3 and its free endbrought into engagement with the the chuck 3, to bring the Worm wheel 99into mesh with the worm 100 through the action of the cam 110 and,throughjthe action of the cam 68 lever .67 connection 64: and lever 63;to bring the cutter intoits predetermined initial operative relation tothe blank. The

handle 17 is then actuated to release the clutph-operating mechanismfrom the lug 19 on the gear 20 and permit the clutch 13 to connect thespindle-driving mechanism with the. power shaft 12. The threading operation then proceeds, the heavy or roughing cut being made duringthe'first revolution of the spindle and the light or finishing cut orcuts being made during the succeeding revolution or revolutions of thespindle, this operationcontinuing until the lug 19 on the gear 20engages the arm 18 of the clutchoperating mechanism and disengages theclutch 13. The operator then moves the hand lever 72 to the limit of itsmovement opposite that shown in Fig. 3. This results in the followingoperations: First, the collar 4 is actuated through the lever 71 andconnection 122 to open the chuck 3 and release the tap blank, second,the cam 110 is actuated through the lever 71 and cam bar 69 to disengagethe worm wheel 99 from the worm 110; third, the bar 95 is returned toits initial position through the action of the cam 114 and lever 115;fourth, the cam 68 is retracted to release the lever 67 and permit thespring 61to move the cutter out of operative position; and, finally, ustat the end of this movement of the cam bar 69 the hook 20 operatesthrough the arm 121 to return the primary cutter carriage 60 toitsinitial position predetermined by the contact of the cam bar 95 with theabutment 97. The tail stock lever is then actuated to release the tapblank and permit its removal. Another tap blank is then put in positionand the above described operations repeated. It will be seen that withthis machine all that is required of the operator is simply to move thetwo levers 35 and 72 to the lim t of their motion in one direction, whenthe spindle automatically stops rotating, replace the threaded blank byanother blank,- return the levers 35 and 72 to their initial positions,and then trip the chuck releasing lever 17. There is no operation thatrequires the eXercise of special care or skill.

The invention in its broader aspects-is not limited to the particularconstruction shown nor to any particular construction by which it hasbeen or maybe carried out, since various changes may be made in thedetails'of the mechanism without departing from the main principles ofthe invention and without sacrificing its chief advantages.

I claim:

1. A machine for threading taps comprising a revolving cutter, blanksupporting and rotating means; means for causing the cutter to take aroughing cut from the blank durmg one revolution thereof; and automaticmeans for advancing the cutter at theaction at a determinate time in therotation of theblank for taking a finishing cut during another rotation.

3. A machine for threading taps and the like, said machine including incombination, a blank support, means for simultaneously cutting aplurality of thread grooves on the blanks, mechanism for rotating eachblank through a predetermined number of revolutions, mechanism foreffecting a relative movement between the blank support and the cutterin the direction of the axis of the blank, said movement being of suchrate as to produce the desired witch of the thread, and mechanism for eecting a predetermined relative advancing movement between the blanksupport and the cutter, said advancing novelnent occurring substantiallybetween consecutive revolutions of the blank.

4. A machine for threading taps and the like, said machine including incombination,

' a blank support, means for simultaneously pitch of the thread, andmechanism for effecti-ng a predetermined'relative advancing movementbetween the blank support and the cutter, said advancing movementoccurring substantially between consecutive revolutions of the blank.

5. A machine for threading taps and, the like, said machine including incombination, a blank support, means for simultaneously cutting aplurality of thread grooves on the blanks, mechanism for rotating eachblank through a predetermined number of revolutions, mechanism foreffecting a relative movement between the blank support and the cutterin the direction of the axis of the blank, said movement being of suchrate as to produce the desired pitch of the thread, mechanism foreffecting a predetermined number of vibrating movements between theblank support and the cutter during each revolution of the blank, andmechanism for effecting a predetermined relative advanc. ing movementbetween the blank support and the cutter, said advancing movement 00-curring substantially between consecutive revolutions of the blank. I

6. A machine for threading taps and the like, said machine including incombination,

a blank support, means for simultaneously cutting. a plurality of threadgrooves on the blanks, mechanism for rotating each blank through apredetermined number of revolutions, mechanism for efi'ecting a relativemovement between the blank support and the cutter in the direction ofthe axis of the blank, said movement being of such rateas to produce thedesired pitch of the thread, and mechanism for separating the blanksupport and cutter after the rotation of the blank has ceased.

7. A machine for threading taps and the like, said machine including incombination, a blank support, means for simultaneously cutting aplurality of thread grooves on the.

blanks, mechanism for rotating each blank through a predetermined numberof revolutions, mechanism for effecting a relative movement between theblank support and the cutter in the direction of the axis of the blank,said movement being of such rate as through a predetermined number ofrevolutions, mechanism for effecting a relative movement between theblank support and the cutter in the direction ofthe axis of the blank,said movement being of such rate as to produce the desired pitch of thethread, mechanism for efl'ecting a' predetermined number of vibratingmovements between the blank support and the cutter during eachrevolution of the blank, mechanism for effecting a predeterminedrelative advancing movement between the blank support and the cutter,said advancing movement occurring substantially between consecutiverevolutions of the blank, and mechanism for separating the blank supportand cutter after the rotation of the blank has ceased, and mechanism forestablishing a predetermined initial relat on between the blank supportand cutter.

9. A machine for threading taps and the.

like, said machine including in combination, a blank support, means forsimultaneously cutting a plurality of-thread grooves on the blanks,mechanism for rotating each blank through a predeterminednumberof'revolutions, mechanism for effecting a relative movementbetween the blank support and the cutter in the direction of the axis ofthe blank, said movement being of such rate as to produce the desiredpitch of the thread, mechanism for separating the blank support andcutter after the. rotation of the blank has ceased, mechanism forestablishing a predetermined intitial relation between the blank supportand cutter, and a. manually operable member for operating saidseparating and initial relation mechanisms.

10. A machine for threading taps and-the like, said machine including incombination,

a blank support, means for simultaneously cutting a plurality of-threadgrooves on the blanks, mechanism for rotating each blank through apredetermined number of revolutions, mechanism for effecting a relativemovement between the blank support and the cutter in the direction ofthe axis of the blank, said movement being of such rate as to producethe desired pitch of the thread, mechanism for effecting a predeterminednumber of vibrating movements between the blank support and the cutterduring each revolution of the blank, mechanism for effecting apredetermined relative advancing movement between the blank support andthe cutter, said advancing movement occurring substantially betweenconsecutive revolutions of the blank, mechanism for separating the blanksupport and cutter after the rotation of the blank has ceased, mechanismfor establishing a predetermined initial relation between the blanksupport and cutter, and a manually operable member for operating saidseparating and initial relation mechanisms.

11. A machine for threading taps and the like, said machine including incombination,

a blank support, means for simultaneously cutting a plurality of threadgrooves on the blanks, mechanism for rotating eachblank through apredetermined number of revolutions, mechanism for efiecting a relativemovement between the blank support and the cutter in the direction ofthe axis of the blank, said movement being of such rate as to producethe desired pitch of the thread, mechanism for effecting a relativemovement between'the blank support and the cutter in a directiontransverse to the axis of the blank, and mechanism for controlling saidrelative, movement mechanisms and estab lishing a predetermined initialrelation between the blank support and the cutter after the rotation ofthe blank has ceased.

12; A machine for threading taps and the like, said machine including incombination, a blank support, means for simultaneously cutting aplurality of thread grooves on the blanks, mechanism for rotating eachblank through a. predetermined number of revolutions, mechanism forefl'ecting a relative movement between" the blank support and the cutterin the direction of the axis of the blank, said movemc nt being of suchrate as to produce the desired pitch of the thread, mechanism foreffecting a relative movement between the blank support and the cutterin a direction transverse to the axis of the blank; a manually operablemember, and mechanism operated by said memher for controlling saidrelative movement mechanisms and establishing a predetermined lnitialrelat-ronbetween the blank support and the cutter after the rotation ofthe said relative movement mechanism and for separating the blanksupport and cutter.

14. A machine for thread ng taps and the like, said machine including incombmatlon,

' a blank support, means for simultaneously cutting a plurality ofthread grooves on the blanks, mechanism for rotating each blank througha predetermined number of revolutions, mechanism for effecting arelative movement between the blank support and the cutter in thedirection of the axis of the blank, said movement being of such rate asto produce the desired pitch of the thread, and mechanism for renderinginoperative said relative movement mechanism, separating the blanksupport and the cutter, and establishing a predetermined initialrelation between the blank support and the cutter.

15. A- machine for threading taps and the like, said machine includingin combination,

a blank support, means. for simultaneously cutting a plurality of threadgrooves on the blanks,,mechanism for rotating each blank through apredetermined number of revolue tions, mechanism for efiecting arelative movement between the, blank support and thecutter the directionoftlie' axis of the blank, said movement of such rate as to produce thedesired pitch of the thread, a

manually operablemember, and mechanism,

opera ed bysaid member for rendering in operative said relativemovementfmecha- I nism, separatingtheblanksupport and the a blanksupport including a spindle pro:

vided with a chuck,- means for simultaneously cutting a plurality ofthread grooves on the blanks, mechanismior rotating the blanks through apredetermined number of revolutions, mechanism for eiiecting a relativemovement between the blank support and the cutter in the-direction ofthe axis of the blank, said movement'bei'ng of such rate as to producethe desired pitch of the thread, and mechanism for actuating said chuck,rendering inoperative said relative movement mechanism, separating theblank support and the cutter and establishing a predetermined initialrelation between the blank support and the cutter.

17. A machine for threading taps and the like, said machine including incombination, a blank support including a spindle provided with a chuck,means for simultaneously cutting a plurality of thread grooves on theblanks, mechanism for rotating the blanks through a predetermined numberof revolutions, mechanism for eiiecting a relative movement between theblank support and the cutter. in the direction of the axis of theblanks, said movement being of such rate as to produce the desired pitchof the thread, a manually operable member,

and mechanism operated by said member for actuating said chuck,rendering inoperative said relative movement mechanism, separating theblank support and the cutter, and establishing-a predetermined initialrelation between the blank support and the cutter.

18. A machine for threading tape and the *like, said machine includingin combination, a blank support, means for simultaneously cutting aplurality of thread grooves on the blanks, a member for eiiecting arelative movement between the blank support and the cutter in thedirection of the axis ofthe blank, automatic mechanism for actuatingsaid member to produce said relative'movement, a manually operablemember for disconnecting said automatic mechanism and returning saidrelative movement member to its initial position. v

19. A machine for threading taps and the like, said 'machine includingin combination, a blank support, means for simultaneously cutting aplurality of thread grooves on the blanks, a member for eflecting arelative movement between the blank support and the cutter in thedirection of the axis of the v blank, automatic mechanism for actuatingsaid member to produce'said relativemovement, a. manually operablemember, and mechanism' actuated by said manually operable member for"separating the blanksupport and the cutter, disconnecting saidautomatic mechanism,- returning said relative movement member-to itsinitial position, and establishing a predetermined initial relationbetween, the blank support and the cutter.

20; A machine for threading taps and the like, said machine including incombination,

a blank support, means for simultaneously cutting a plurality of threadgrooves on the blanks, a member for eflecting a relative movementbetween the blank support and the cutter in the direction of the axis ofthe blank, automatic mechanism for actuating said member throughdifferent distances to produce different relative movements benamestween the blank support and the cutter, and

a manually operable member for disconnect ing said automatic mechanismand returning said relative movement member to its initial position.

21. A machine for threading taps and the like, said machine including incombination, a blank support, means for simultaneously cutting aplurality of thread grooves on the blanks, a member for efiecting'arelative movement between theblank support and the cutter in thedirection of the axis of the blank, automatic mechanism for actuatingsaid member through different distances to produce dilferent relativemovements between the blank support and the cutter, a manually operablemember, and mechanism actuated by said manually operable member forseparating the blank support and the cutter, disconnecting saidautomatic mechanism, returning said relative movement member to itsinitial position, and establishing a predetermined initial relationbetween the blank support and the cutter.

22. A. machine for threading taps and the like, said machine includingin combination, a blank support, means for simultaneously cutting aplurality of thread grooves I on the blanks, a member for effecting arelative movementrbetween the blank support and the cutter in thedirection of the axis of the blank, automatic mechanism foractuatingsaid member through a relatively great distance to produce aproportionately small relative movement between the blank support andthe cutter, and-a manually operable member for disconnecting saidautomatic 1 mechanism and returning said relative move- Jan ment memberto its initial position.

' 23. A machine for threading taps and the like, said machine includingin combination, a blank support, means for simultaneously' cutting aplurality of thread grooves on the blanks, a member for efiect:

ing a relative movement between the blank 'support and the cutter in thedirection of the aXis of the blank, automatic mechanism for actuatingsaid member through a' relatively great distance to produce aproportionately small relative movement. between the blank support andthe cutter, a manually operable membemand mechanism actuated by saidmanually operablemember for separating the blank support and the cutter,disconnecting the said automatic mechanism, returning said relativemovement memberto its initial position, and establishing a predeterminedinitial relation between the blank support and the cutter.

24. A machine for threading taps and the like, said machine including incombination, a blank support, means for simultaneously cutting a,plurality of thread grooves on the blanks, a member for effecting arelative movement between the blank, support and the cutter in thedirection of the axis of the blanln'automatic mechanism for actuatingsaid member to produce said relative movement, a manually operablemember for releasing said relative movement *member from said automaticmechanism, returning the released member to its initial position andsecuring it to said automatic mechanism.

25. A machine for threading taps and the like, said machine including incombination, a blank support, means for simultaneously cutting aplurality of thread grooves on the blanks, a member for effecting arelative movement between the blank support and the cutter in thedirection of the axis of the blank, automatic mechanism for actutivemovement member from said automatic I mechanism, returning thereleasedmember to its initial position, resecuring it to said automaticmechanism, and establishing a predetermined initial relation between theblank support and the cutter.

26. In. a; machine for threading taps, re volving cutters and blanksupporting and rotating means; means for causing the cutters to take aroughing cut during one rotation of the blank, means for causingrelative displacement of the cutters and the blanks parallel to the axisof the blank in proper proportion for the pitch of the thread; and meansautomatically brought into action at a. determinate point in the ro-"tation of the blank for then advancing the cutters nearer the axis ofthe blank to take a finishing cut. a g I 27. In a machine for threading\taps, revolving cutters, blank supporting and rotating means; means forcausing the cutters to take a roughing cut during a rotation of theblank, means for causing relative displacement of' the cutters andtheblanks parallel to the axis of the blank in proper fecting apredetermined number of vihra tory movements between the blankandcutter' during each revolution of the blank, and means for effecting arelative advancing movement between the blank su'pport and ment betweenthe blank and cutter, and

ter during each revolution of the blank,

means for efl'ecting a relative advancing movement between the blanksupport and the cutter, said advancing movement occurring substantiallybetween successive revolutions of the blank.

30. A metal working machine including in combination, a blank support,mechanism for rotating the blank through a plurality of revolutions, acutter, mechanism 'for effecting a predetermined number of vibratorymovements between the blank and cutmeans for effecting a relativeadvancing movement between the blank support and the cutter, saidadvancing movement occurring substantially between successiverevolutions of the blank, and means for separate ing the blank andcutter after a predetermined number of revolutions of the blank haveccurred.

31. A metalworking machine including in combination, a blank support,mechanism for rotating the blank through a p ality of revolutions, acutter, mechanism f r eff fecting' a predetermined number ofvibra torymovements between the blank and cutter during each revolution of theblank, means for effecting a relativeadvancing movement between theblank support and the cutter, said advancing movement occur ringsubstantially between successive revolutions of'the blank, a manuallyoperable member, and means operated by said memher for separating theblank and cutter after a predeterminedlnumber of revolutionsv of theblank have occurred.

' .tory movements betweenithe blank and v 32. A metal working machineincluding in combination, a blank support, mechanism for'rotating theblank through a plurality of revolutions,- a cutter, mechanism foreffecting apredetermined number of -vibracutter during each revolutionof the, blank, means for efiecting a relative advancing movement betweenthe-blank support and the cutter, said advancing movement occurringsubstantially between successive revolutions of the blank, mechanism foroperating the blank and cutter after a predetermined numberofrevolutions of the blank blank support and the cutter, a manuallyoperable member, and means operated by said member for actuating saidseparating mechanism and said initial (relation mecha- 33. A metalworking machine including in combination, a blank support, a vcutter,mechanism for rotating the blank through a predetermined number ofrevolutions, and

mechanism for effecting a predetermined j relative approachmg movementbetween the blank support and the cutter, said a preaching movementoccurring substantially between consecutive revolutions of the blank.34. A metal working machine including in combination, a blank support, acutter, mechanism for establishing a predetermined initial relationbetween the blank supportin combination, a blank. support, a .cutter,

mechanism for establishing a predetermined initial relation between theblank support and ,cutter, mechanism for rotating the blank through apredetermined number of revolutions, mechanism for effecting apredetermined. relative approaching movement between the blank supportand the cutter, said approaching movement occurring substantiallybetween consecutive revolutions of the blank, mechanismfor separatingthe blank and cutter after the rotation of: the blank has ceased, amanually operable member, and .means operated by said member foractuating said separating mechanism and said initial relation mechanism.

in combination, a spindle provided with a chuck, a cutter, mechanism foreffecting a relative movement between the spindle and the cutter, amanually operable member, and means actuated by said manually operablemember for operating'said chuck and for rendering operative saidrelativemovement -mechanism. n

37. A' metal working-machine including in combination, a' spindleprovided with a chuck, a cutter, mechariisnlior effecting a relativemovement between the spindle and x the cutter to bring the spindle andcutter into cooperative relationship and to perform the cuttingoperation, amanually operable member, and means "actuated by said man-36. A metal working machine including ually operable member foroperating'said have occurred, mechanism for establishing a predeterminedinitial relation between the chuck and for rendering operative saidrela- Y ating said separating mechanism.

combination, a spindle provided with a chuck, a cutter, a feed screwrotating in unison with said spindle, mechanism operated by said feedscrew for effecting a relative movement between the spindle and thecutter, a manually operable member, and means actuated by said manuallyoperable member for actuating said chuck and for connecting anddisconnecting said feed screw and the mechanism operated thereby.

39. A metal working machine including in combination, a blank support, acutter support, mechanism for effecting a relative feeding movementbetween said supports,

mechanism for establishing a predetermined a chuck, a cutter support,mechanism for effecting a relative feeding movement between saidsupports, mechanism for, separating said supports, a manually operablemember, and means actuated by said manually operable member forrendering inoperative said feeding mechanism and for actuating saidchucks and said separating mechanism.

42. A metal working machine including in combination, a blank supportprovided with a chuck, a cutter support, mechanism for effecting arelative feeding movement be-. tween said supports, mechanism forseparating said supports, a manually operable member, and means actuatedby said manually operable member for rendering inoperative said feedingmechanism, actuating said chuck and said separating mechanism,

and establishing a predetermined initial relation between said supports.

43. A metal working machine including in combination, a blank support.provided with a chuck, a cutter support, mechanism for effecting arelative feeding; movement between said supports, said blank supportcomprising 'a movable member mounted at the ,side of the blank oppositethe cutter and arranged to engage the end of the blank, a

manually operable member, and means actuated by a single movement ofsaid manually operablemember for positioning and clamping said movablemember.

44. A metal working machine including in combination, a tail stockcomprising a pivoted member, a stop shoulder and a cooperatingprojection, said cooperating parts having surfaces constructed to fixthe position of said pivotedmember and clamp it, and a manually operablemember for actuating said pivoted member.

45. A metal Working machine including in combination, a tail stockcomprising a pivoted member, a stop shoulder and a cooperatingprojection, said cooperating parts having surfaces constructed to fixthe position of said pivoted member and clamp it, and a togglecomprising a hand lever and a link for actuating said pivoted member.

46. A machine for threading taps and the like, comprising, incombination, means for supporting and rotating a blank, means forcutting grooves near one end of the blank, said blank supporting meanscomprising a movable member mountedat one side of the blank and arrangedto engage the end of the blank, and means for positioning and' clampingsaid movable member.

47. A machine for threading taps and the likecomprising, in combination,means for supporting and rotating a blank, means for cutting threadgrooves near one end of the blank; said blank supporting meanscomprising a movable member mounted-at the side of the blank oppositethe cutter and arranged to engage the end of the blank, a

- manually operable member, and means actuated by a single movement ofsaid manually operable member for positioning and clamping said movablemember.

48. A machine for threading taps and the like, comprising, incombination, means for supporting and rotating a blank, means forsimultaneously cutting a plurality of thread grooves near one end of theblank, said blank supporting means comprising a movable member mountedat one side of the blank opposite the cutter and arranged to engage theend of the blank, and means for positioning and clamping said movablemember.

In testimony whereof, I have signed m name to this specification, in thepresence of two subscribing witnesses/ I FRIEDERICH MULLER.

, Witnesses:

' LUTHER C. MORRISON,

WILLIAM J. DoLAN.

